I installed ubuntu 11.04 alongside windows 7 on a partition that previously had ubuntu 10.04. It installed perfectly but on completion, after the reboot, the boot menu shows just 'memtest' and windows 7 as options - no option for loading ubuntu.

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Assuming that ubuntu is actually installed, you should be able boot into the live cd and then rerun the autoconf for grub. (Does anyone know how to run that autoconfig script?)
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user606723Jul 22 '11 at 20:40

How did you install? This is a known issue with Wubi installs when the user hits SKIP during the install.
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bcbcJul 23 '11 at 5:04

4 Answers
4

(I expect this question will be moved to Ask Ubuntu, but I'll throw this answer on while we wait).

First, boot to a live cd to make sure your installed Ubuntu partition is still there (I fully expect it to be).

Second, (assuming the 1st step showed you that you still have an Ubuntu install) look at your partition table and your grub.conf file - make sure it's the grub.conf file of your installed system, not the live cd :) You may just have to manually write in the line for your Ubuntu partition. It's odd that the generated grub.conf file would be broken.

In case you have more than one hard drives, you could have installed the new bootloader on the other (or one of the others, if you have more than two) drive. Changing the boot device priority can grant you access to that bootloader.